Hertel K010311AS Thread Forming Tap 3-48 Unc Bottoming Hss

Product Description

The HERTEL K010311AS is a thread forming tap designed for creating internal threads in blind holes without cutting chips. Manufactured from high-speed steel (HSS) with a bright, uncoated finish, this tap uses material displacement rather than material removal to produce strong, work-hardened threads. It is configured for 3-48 UNC threading with a bottoming chamfer of 1-2 threads, allowing it to form threads close to the bottom of a blind hole. Overall length is 1.8125 inches with a thread length of 0.5 inches. The H3 thread limit designation indicates a controlled tolerance class suitable for standard UNC fits. Machinists and tool and die technicians are the primary users.

This tap is suited for blind hole threading applications in soft to medium-hardness materials where chip evacuation is a concern. The thread forming method produces no chips, making it well-matched for use in CNC machining centers, drill presses, and tapping machines where blind cavities are common. The 3-48 UNC designation targets small-diameter fastener applications found in precision assemblies, electronics enclosures, and instrumentation hardware.

Key Features

• Thread forming design displaces material rather than cutting, eliminating chips in blind holes
• Bottoming chamfer (1-2 thread lead) allows threading close to the bottom of a blind hole
• High-speed steel construction provides toughness and wear resistance for general-purpose tapping
• H3 thread limit for controlled tolerance fit on standard 3-48 UNC threads
• Bright, uncoated finish suitable for use with standard tapping fluids
• Right-hand thread direction, shank diameter of 0.141 inches and square drive of 0.110 inches

Compatibility

Designed as an OEM-style replacement or direct-use thread forming tap for 3-48 UNC blind hole applications in standard tapping chucks and holders accepting a 0.141-inch shank diameter.

Installation Notes

Thread forming taps require a properly sized forming tap drill rather than a standard cut tap drill - consult a thread forming drill chart for the correct hole diameter before use. Apply an appropriate tapping fluid or cutting oil to prolong tap life and improve thread quality. Secure the workpiece firmly before tapping and ensure the tap is driven straight into the hole to avoid tap breakage, especially at this small diameter. Always follow applicable shop safety procedures and machine manufacturer guidelines when operating tapping equipment.